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No. 6|2,3l6. Patented Dot. ll, I898.

J. F. DOWNES.

EXPANSION BOLT.

(Application filed Nov. 26, 1897.)

(No Model.)

i i J Zr; 5 (Z 1 j I e WITNESSES. /N VENTOH \\\\\\\\\I r- QMliv I By ATTOHN E YS.

' UNITED I STATES PATENT OFFICE.

JAMES F. DOW'NES, OF NEW YORK, N. Y.

EXPANSION-BOLT.

SPECIFICATION forming part of Letters Patent No. 612,316, dated October11, 1898.

I Application filed November 26, 1897. $erial1l'o. 659,866. We model.)

' T0 aZZ whom it may concern:

Be it known that I, JAMES F. DOWNES, of New York city, in the county andState of New Yorlghave inventeda new and Improved Expansion-Bolt, ofwhich the following is a full, clear, and exact description.

My invention relates to an improvement in expansion-bolts, having forits object to make the same more convenient to use and so that they willafford a more secure hold in the holes drilled therefor in stone orother material than bolts of the class as heretofore constructed.

The invention comprises certain features of construction andcombinations of parts,whioh will be hereinafter described, andparticularly pointed out in the claim.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a cross-sectional view taken through a block having a coupleof bolts inserted therein, one of the bolts being shown in partialsection. Fig. 2 is a partial sectional view showing a bolt separately.Fig. 3 is a view showing the split sleeve; and Fig. 4 is a View inpartial section, showing the manner of constructing the bolt in aslightly-different form.

The bolt comprises three separate men1 hers-the bolt proper, B, which isthreaded and provided with means by which it may be turned, a splitsleeve D, surrounding the bolt, and the cone 0, which is drawn into thesleeve by turning the bolt.

In the drawings, A represents a block of any material and which isprovided with holes adapted to receive the expansion-bolts. The holesare made of such a size that the bolts will easily slide therein and yetfit comparatively close. Thesplit sleeve D is preferably made as a tube,and the slotE therein is extended to near the opposite end andterminates in a round hole 6, the object of the hole a being to preventthe slot being extended by use and to make the sleeve more flexible. Theinner end of the sleeve D is roughened externally, so that it may obtaina more secure hold .upon the material A. As

shown in Figs; 1 and 4, this roughening is obtained by forming a bead clupon its innor end. As shown in Figs. 2 and 3, this roughening issecured by cutting threads (1 upon the inner end of the sleeve orforming a series of peripheral grooves therein. This secures a firm holdupon the material A and prevents the sleeve from pulling out.

The cone 0 is provided with a sloping surface F, the inner or smallerend of which is approximately the size of the inner diameter of thesleeve. The cone is extended at its inner end in the form of a shortcylinder f, the object of the same being to enable the sleeve to holdthe cone more securely while it is being inserted in place. By thismeans the block 0, having the sloping surface or cone F formed thereonmay be held by the inner end of the sleeve, so that it cannot fall outof the same, and yet without expanding the end of the sleeve. This block0 is provided with a central threaded hole adapted to receive the boltin those cases where the block is made separate from the bolt.

In Fig. 1 the bolt is shown as being used to secure a staple J to awall, the staple being adapted to secure a pipe against the wall.

In Fig. 4 the block 0 and the cone F, forming a part thereof, are shownas constructed upon one end of the bolt B. In this case a nut G isplaced upon the bolt outside of the sleeve D, the nut being placed atsuch a point that it may be flush with the surface of the stone or othermaterial to which the bolt is to be secured. This bolt is shown asprovided with an outer nut II, and is also provided at its outer endwith a slot I, adapted to be engaged by a screw-driver to preventturning of the bolt while the nut G is being tightened. This sort ofbolt would be used where the bolt is to be secured to a slab and thearticle to be attached is to be applied thereafter and screwed down by aseparate nut. This bolt is, however, exactly the same in principle asthose shown in the other views. Having thus described my invention, Iclaim as new and desire to secure by Letters Patent- An expansion bolt,comprising a sleeve formed as a short tube section having longitudinalslots therein extending inward from belt for drawing said cone into thesleeve, subone end and an exterior peripheral bead or stantially asdescribed.

flange at the split end, a cone adapted to en- 1 T T ter the split endof said sleeve and having a JAMES 5 cylindrical section at its small endwhereby the sleeve is enabled to hold the cone without being itselfexpanded, and a threaded lVitnesses:

JNo. M. RITTER, HENRY O. EINOLF.

